Does anyone out there happen to know the size & pitch of the spindle threads on the EB 4424? I know its a reverse thread but don't know the size. I've had mine for several years and due to regular use - and a little abuse I guess - the threads on the spindle have become dinged up to the point where I can't get the nut on completely - I have to stack up several flat washers to get enough bite on the sanding drum. The threads are not stripped - just dinged. I tried using a neighbor's thread refurbisher tool but that didn't really help. I thought if I could find a matching die I could clean the threads up without actually cutting new ones.